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  • the anisotropy of thermal conductivity in diborides of zirconium and hafnium

    Paper number

    IAC-13,C2,P,33.p1,x17941

    Author

    Dr. Luo Xiaoguang, China Academy of Aerospace Aerodynamics(CAAA), China

    Coauthor

    Dr. Ai Bangcheng, China Aerospace Science and Industry Corporation, China

    Coauthor

    Mr. Miao Wenbo, Chinese Society of Astronautics, China

    Year

    2013

    Abstract
    Diborides of zirconium and hafnium based ultra high temperature ceramics have been widely used as non-ablative thermal protection materials. The elastic anisotropy plays an important role in their thermal conductivity behavior. In this paper, the anisotropic elastic and thermal properties of layered ZrB2 and HfB\small 2 with the AlB\small 2 structure have been investigated by from first principles using density functional theory in a wide temperature ranges. The factors determining the significance in anisotropy in AlB\small 2-type diborides are discussed from crystal structure and atomic bonding characters. For instance, the calculated in-plane thermal conductivity is always larger than that along the c-axis, parallel to the layer stacking direction.
    Abstract document

    IAC-13,C2,P,33.p1,x17941.brief.pdf

    Manuscript document

    IAC-13,C2,P,33.p1,x17941.pdf (🔒 authorized access only).

    To get the manuscript, please contact IAF Secretariat.